Why would you want to remove directx? If you want to ensure you got the directx working in your computer use the webupdater of it, or download the offline package of it, and run it. It'll replace files which are older than the ones in the release your installing.
If you try to haxor uninstall you directx installation, you seriously can mess up your system, so I would advise against using any uninstaller haxs to get rid of directx Scott
